Type-writer platen.



110.388.556. A PATENTED MAY 26, 1908.

W. R. VAN SLYKE.

TYPE WRITER PLATEN. APPLICATION FILED FEB. 5, 1907 w Y' Q. w

Wi h1 @com sTATns PATENT ormoni.

WILLIAM a. vAN sLYKE, or EVELETH, MINNESOTA.

TYPE-WRITER PLATEN.

Specification of Letters Patent.

Patented May 26, 1908.

Application filed February 5, 1907. Serial No. 355,881.

T 0 all whom it may concern:

Be it known that I, WILLIAM R. VAN SLYKE, a mining engineer, citizen ofthe United States of America, residing at Eveleth, in the county of St.Louis and State of Minnesota, have invented new and useful Tm rovementsin Type-VVriter Platens, of which the following is a specification.

This invention relates to improvements in typewriter platens, andparticularly to the construction of a platen whiciL will materiallyreduce or completely deaden the noise resulting from the striking of thetype bars against the platen.

The object o'f the invention is to provide a.

simple construction of platen designed to secure this advantage, and inwhich the construction is such as to permit ready asseinblage of partsin forming the laten and disassemblage of the same in ma ing repairs.

ln the accompanying drawing-Figure l is a longitudinal section of atypewriter platen embodying my invention. Fig. 2 is a plan view of thetubular body thereof. .'Fig. 3 is an end elevation of the platen. Fig. 4is a cross section thereof.` Figs. 5 to 8, inelusive, are' detailsections, showing heads diering inconstruction for connection with theends of the tubular body.

In carrying myinvention into practice, I provide a platen comprising atubular body 1, and end pieces or heads 2 and 3. The tubular body 1 isopen at each end and is preferably formed by moldingor otherwise ofvulcanized rubber having embedded therein one or more concentric tubesor layers of wire cloth o1' other woven material 4' of any desired mesh.Preferably at least two 'layers or tubes of reticulated material areafter described.

The end pieces or heads 2 and 3 are preferably forme of cast metal, andare connected by a hollow or tubular core 5 adapted for the passage ofthe usual platen spindle. The core is preferably cast integral with thehead l2 and is threaded at its free end, as shown at y6, to enter athreaded opening 7 in the head 3, whereby the latter is secured thereto.The heads are annularly grooved to receive and hold the ends of thecylinder or tubular body portion 1, and to this end each head is rovidedwith a pair of inwardly exten ing Hanges 8 and 9, forming an interveninggroove l() to receive the adjacent end of the cylinder'.

In the form shown in Fig. 1,the ends of the cylinder are reduced toenter the grooves, and the inner surface of eachiiange 9 is beveled tocrowd the same against the flange 8, thus securing a tight connection.After one end of the tubular body or cylinder has been slipped into thegroove of the head 2, the head 3 is applied in position, and its groovereceives the outer end of the cylinder, rubber or other suitable cementbeing employed to secure the said ends of the cylinder to the heads andto hermetically seal the joints between them. A similar cement is alsoprovided between the threaded'portions 6 and 7 to hermetic'ally seal thejoint between the head 3 and core 5 at their point of connection.

within the platen between the cylinder or tubular body portion and core5 to receive a confined body of air, which backs said cylinder and holdsit inflated and at the same time permits it to yield sufliciently tocushion the action of the type bars, the escape of thel confined body ofair being prevented by hermetically sealing the joints in the mannerAdescribed. The head 3 may be suitably constructed in practice for theapplication thereto of any fparticular type of end plate characteristico different makes of typewriters.

Air is introduced into the chamber 11 through the medium of an air valvemounted upon the head 2, which valve comprises a casing 12 threaded intoan opening 13 into said head and projecting interiorly and eX- teriorlythrou h the saine.` The outer end of A embedded therein.

-duced' end of the cyli through the inner en d wall of the casing and isnormally held in closed position by a coiled spring 18, said springencircling the stem between the valve .and

may be charged with air in a convenient manner, the valve opening to.allow the air to enter, then closing to preventits escape. The outer4end of the casing forms a tubular receptacle 19 to contain a sealingmedium of anykind to prevent the ossible escape of any air after thecham er 11 has Abeen charged, and the joint between the casing and head2 is sealed by. the use of cement in the manner previously described.

It will thus be seen that a practically noiseless or sound-deadeningplaten will be provided without the use of an interior airolding andcushioning tube, and that thev strength of the cylinder or tubular bodyportion and its capacity to sustain wear, as well as its sonnd-deadeningqualities, are increased by the use of the reticulated fabric If throughwear it is found at any time necessary to replacethe cylinder l with anew cylinder, the parts may be disassembled by forcibly unscrewing thehead 8, whereupon the cylinder maybe disconnected and a new one appliedto the heads in its place in the manner previously described.

In Figs. 5 to 8, inclusive, I have shown different ways of. securing theends of the cylinder to'the heads, the construction shown in Fig. 5differing from that shown in Fig. l only in omitting the beveled portionof the Harige 9, thus obviating the necessity of reducing the ends ofthe cylinder. In Figs. 6, 7 and 8 but a single flange is employed, thellange 9 in Fig. 6 being internally beveled to form a seat face for-thebeveled end of the cylinder, while in Figi? the flange .9b is setinwardly from the peri hery of the head and engages the groove in t 1eend of the cylinder, and in Fig. 8 the .flange 9 is set still fartherinward and forms a su port for the unren er which is secured upon theouter surface of the same. Any of these or equivalent modes ofconnecting the ends'of the cylinder with the heads may be employed.

Having thus described the invention, what is claimed as new, is

1. A typewriter platen having an impact surface formed of hardenedplastic material, said surface being provided with a plurality of layersof woven reticulated material embedded therein, said layers being inspaced relation, with the strands of one arranged in planes crossing theinterstices of the other to dispose their meshes out of alinemcnt,whereby to provide a compound barrier against the.

passage of sound waves.

2. A typewriter platen comprising heads, each provided with a pair ofconcentric in- ,wardly extending flanges forming receiving grooves, theouter flange being internally beveled or flared, a tubular non-resonantbody provided with a layer of reticulated material embedded therein andhaving its endfportion reduced and fitted within said grooves andclamped by the beveled faces of the outer flanges against the innerflanges, a hollow stem integral with one of the heads and having adetachable other head, and means for infiating the platen. y I

3. A typewriter platen comprising end heads, one provided with athreaded opening, a tubular core or stem connecting said heads, atubular, non-resonant body terminally secured to the heads and formingwith said heads an interior air chamber, and an inlet valve comprising acasing extending within and without the perforated head and eX.-ternally threaded to therein, said casing being provided with anintermediate air port, an inner end wall, side ports in the inwardlyextending portion, a stop flange on the outwardly extending portion tolimit its inward movement, said outwardly extending portion beingprovided with a chamber to receive a sealing medium, a valve mounted inthe interiorly projecting portion and controlling the ports, a stemconnected with the valve and slidably engaging the inner end wall, and acoiled spring encircling the stem between the valve and inner end wall.

'In testimony whereof, I afhX in presence of two witnesses.

WILLIAM It. VAN SLYKE. Witnesses 'D..W. FREEMAN,

El?. ItUMsEY.

my signature connection with theA engage the opening

